Hi Lou,
Unfortunately, it looks as if my hubby tossed it when he did his mass spring cleaning before he left. There is a new box of the stuff that we bought at the BX here in Germany. It's the same as what you are talking about...Salisbury House, Weyside park address. Everything is in Kilo & grams, so it's a subsidiary product of the American company.
There's a product website at www.miraclegro.com. I looked around & they didn't really discuss product warnings. But there is a contact page, if you'd like to send in a query about product warning & safety.
Sorry, I couldn't help you out anymore than this.
toodles